<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>页面添加水印</title>
    <script src="https://unpkg.com/jquery@3.6.0/dist/jquery.js"></script>
    <style>
        .watermark-wrapper{
          height: 1000px;
        }
    </style>
</head>
<body>
<div id="watermark-wrapper" class="watermark-wrapper">
    
</div>
 
</body>
<script>
 
    $(document).ready(function() {
       var watermark_txt = "测试效果" + getDate();
       watermark({"watermarl_element":"watermark-wrapper", "watermark_txt":watermark_txt});
    });
 
    function watermark(settings) {
        //默认设置
        var defaultSettings={
            watermarl_element:"body",
            watermark_txt:"",
            watermark_x:10,//水印起始位置x轴坐标
            watermark_y:10,//水印起始位置Y轴坐标
            watermark_rows:2000,//水印行数
            watermark_cols:2000,//水印列数
            watermark_x_space:50,//水印x轴间隔
            watermark_y_space:50,//水印y轴间隔
            watermark_color:'#d7d7d7',//水印字体颜色
            watermark_alpha:0.5,//水印透明度
            watermark_fontsize:'15px',//水印字体大小
            watermark_font:'微软雅黑',//水印字体
            watermark_width:500,//水印宽度
            watermark_height:50,//水印长度
            watermark_angle:15//水印倾斜度数
        };
        //采用配置项替换默认值，作用类似jquery.extend
        if(arguments.length===1&&typeof arguments[0] ==="object" ) {
            var src=arguments[0]||{};
            for(key in src) {
                if(src[key]&&defaultSettings[key]&&src[key]===defaultSettings[key]){
                    continue;
                } else if(src[key]){
                    defaultSettings[key]=src[key];
                }
            }
        }
 
        var oTemp = document.createDocumentFragment();
 
        var maskElement=document.getElementById(defaultSettings.watermarl_element) || document.body;
        //获取页面最大宽度
        var page_width = Math.max(maskElement.scrollWidth,maskElement.clientWidth);
        //获取页面最大高度
        var page_height = Math.max(maskElement.scrollHeight,maskElement.clientHeight,maskElement.scrollTop);
        //水印数量自适应元素区域尺寸
        defaultSettings.watermark_cols=Math.ceil(page_width/(defaultSettings.watermark_x_space+defaultSettings.watermark_width));
        defaultSettings.watermark_rows=Math.ceil(page_height/(defaultSettings.watermark_y_space+defaultSettings.watermark_height));
        var x;
        var y;
        for (var i = 0; i < defaultSettings.watermark_rows; i++) {
            y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
            for (var j = 0; j < defaultSettings.watermark_cols; j++) {
                x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
                var mask_div = document.createElement('div');
                mask_div.id = 'mask_div' + i + j;
                mask_div.className = 'mask_div';
                //mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
                mask_div.innerHTML=(defaultSettings.watermark_txt);
                //设置水印div倾斜显示
                mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                mask_div.style.visibility = "";
                mask_div.style.position = "absolute";
                mask_div.style.left = x + 'px';
                mask_div.style.top = y + 'px';
                mask_div.style.overflow = "hidden";
                mask_div.style.zIndex = "1029"; // 9999
                // pointer-events:none  让水印不遮挡页面的点击事件
                mask_div.style.pointerEvents='none';
                // 设置边框
                // mask_div.style.border="solid #eee 1px";
                // 兼容IE9以下的透明度设置
                mask_div.style.filter="alpha(opacity=50)";
                mask_div.style.opacity = defaultSettings.watermark_alpha;
                mask_div.style.fontSize = defaultSettings.watermark_fontsize;
                mask_div.style.fontFamily = defaultSettings.watermark_font;
                mask_div.style.color = defaultSettings.watermark_color;
                mask_div.style.textAlign = "center";
                mask_div.style.width = defaultSettings.watermark_width + 'px';
                mask_div.style.height = defaultSettings.watermark_height + 'px';
                mask_div.style.display = "block";
                oTemp.appendChild(mask_div);
            };
        };
        maskElement.appendChild(oTemp);
    }
 
    function getDate() {
        var d = new Date();
        var year = d.getFullYear() >= 10 ? d.getFullYear() : ('0'+d.getFullYear());
        var month = d.getMonth()+1 >= 10 ? d.getMonth()+1 : ('0'+d.getMonth()+1);
        var day = d.getDate() >= 10 ? d.getDate() : ('0'+d.getDate());
        var hour = d.getHours() >= 10 ? d.getHours() : ('0'+d.getHours());
        var minute = d.getMinutes() >= 10 ? d.getMinutes() : ('0'+d.getMinutes());
        var second = d.getSeconds() >= 10 ? d.getSeconds() : ('0'+d.getSeconds());
        return year+"-"+month+"-"+day+" "+hour+":"+minute+":"+second;
    }
 
</script>
</html>
